Offline Pages: Replace Observer::OfflinePageModelChanged with OfflinePageAdded.

components/offline_pages/offline_page_model.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 60 matching lines @@
     // The original URL of the page to save. Empty if no redirect occurs.
     GURL original_url;
   };
 
   // Observer of the OfflinePageModel.
   class Observer {
    public:
     // Invoked when the model has finished loading.
     virtual void OfflinePageModelLoaded(OfflinePageModel* model) = 0;
 
-    // Invoked when the model is being updated, due to adding, removing or
-    // updating an offline page.
-    virtual void OfflinePageModelChanged(OfflinePageModel* model) = 0;
+    // Invoked when the model is being updated due to adding an offline page.
+    virtual void OfflinePageAdded(OfflinePageModel* model,
+                                  const OfflinePageItem& added_page) = 0;
 
     // Invoked when an offline copy related to |offline_id| was deleted.
     virtual void OfflinePageDeleted(int64_t offline_id,
                                     const ClientId& client_id) = 0;
 
    protected:
     virtual ~Observer() = default;
   };
 
   using CheckPagesExistOfflineResult =
@@ skipping 80 matching lines @@
   // TODO(dougarnett): Remove this and its uses.
   virtual bool is_loaded() const = 0;
 
   // Returns the logger. Ownership is retained by the model.
   virtual OfflineEventLogger* GetLogger() = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_